package com.qk.interceptor;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

/**
 * ClassName: TokenInterceptor
 * Package: com.qk.interceptor
 * Description:
 *
 * @Author zt
 * @Create 2025/7/31 18:23
 * @Version 1.0
 */
@Slf4j
@Component
public class TokenInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //1.获取请求路径
        String uri = request.getRequestURI();
        //2.判断是否是登录请求
        if(uri.contains("login")){
            log.info("登录请求：{}，放行", uri);
            return true;
        }

        //3.获取请求头 token
        String jwt = request.getHeader("token");
        //4.判断token是否为空，如果不存在，响应401状态码
        if(jwt == null || jwt.isEmpty()){
            log.info("请求头token不存在");
            response.setStatus(401);
            return false;
        }

        //5.解析令牌，如果解析令牌报错，响应401状态码
        try {
            Claims claims = JwtUtils.parseToken(jwt);
            Integer userId = claims.get("id", Integer.class);
            log.info("当前用户ID，存入ThreadLocal");
            CurrentUserHoler.setCurrentUser(userId);//解析后获得的UserId存取ThreadLocal
        }catch (Exception e) {
            log.info("令牌解析失败");
            response.setStatus(401);
            return false;
        }
        //6.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //7.请求处理完成后，清空ThreadLocal
        log.info("解除ThreadLocal中的登录用户信息");
        CurrentUserHoler.removeCurrentUser();
    }
}
